So I've looked it up and I can get the constrictor in Manhattan bunker stage and the battle harness in nawlns. Well as you know, the very next stage in the story after choosing your contraption is the Manhattan bunker.

Everything I'm seeing online says you must retrieve the other 2 contraptions during the üburcommando missions specifically. So I'm just checking to make sure. I absolutely can \not\ find and collect the constrictor during the next story mission? I have to wait till the übercommando missions right?

If I can collect it during the dossier mission, can you tell me where it's supposed to be? I'm saved right before I pick up the dossier and want to know if I should go look for it before I grab the story MacGuffin.

Pretty sure you have to pick it up afterwards.

As in, not during the story mission but only during the üburcommando missions. Correct?

Yes. You can't collect it in the story mission.

Awesome thanks so much

You're welcome.